Marchmont is a Grade A-listed Palladian mansion built in 1750-1755 by Hugh Hume-Campbell, the 3rd Earl of Marchmont, under plans drawn up by William Adam and executed by Thomas Gibson. The interior is arguably one of the finest in Scotland, and the house retains many of its original features, including the magnificent George II period plasterwork by Thomas Clayton.

Major changes were made between 1914 and 1917 when then owner Robert Finnie McEwen commissioned the eminent Scottish architect Sir Robert Lorimer to enlarge and modernise the house, and it stands today as perhaps the finest example of his grand house refurbishments.

Marchmont was awarded the 2018 Historic Houses Award, sponsored by Sotheby's, for its seven-year restoration. The house contains some of the finest Georgian interiors in Scotland, Lorimer's magnificent oak-panelled Music Room, and an eclectic art and furniture collection spanning 550 years of art history.
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Marchmont is a private family home at the heart of the Marchmont Estate, to the east of the village of Greenlaw in the Scottish Borders, and lies at the end of the longest planted avenue in Scotland (1.3 miles).

Marchmont is open to the public on a limited number of days each year for guided tours and musical events.